package cn.tedu.v5;

import java.io.*;
import java.net.ConnectException;
import java.net.Socket;
import java.net.UnknownHostException;
import java.util.Scanner;

public class Client {
    private Socket socket;
    private static final String HOST="172.20.17.9";
    private static final Integer PORT=6666;
    private PrintWriter pw;
    private BufferedReader br;

    public Client() {
        try {
            socket=new Socket(HOST,PORT);
            br=new BufferedReader(new InputStreamReader(socket.getInputStream(),"UTF8"));
            pw=new PrintWriter(new BufferedWriter(new OutputStreamWriter(socket.getOutputStream(),"UTF8")),true);
        } catch (NullPointerException e){
            System.out.println("友情提示：IP传入错误导致链接失败~");
        } catch (UnknownHostException e){
            System.out.println("友情提示：IP传入错误");
        } catch (ConnectException e){
            System.out.println("客户端链接失败：建议检查IP或者端口号");
        } catch (IOException e) {
            System.out.println("客户端链接服务器失败，提示：检查IP/端口");
        }
    }

    public void start(){
        //与服务器端交互---参考Server
        System.out.println("~~欢迎使用昭宇牌QQ聊天室~~");
        Scanner input=new Scanner(System.in);
        try {
            //1.读入服务器端： “请输入用户名：”
            String serverMessage=br.readLine();
            //1.1显示“请输入用户名：”
            System.out.println(serverMessage);
            //1.2 用户输入--用户名
            String username=input.nextLine();
            //1.3 用户输入的用户名--写出给服务器端
            pw.println(username);

            //2.1 读入服务器端发来 "请输入密码："
            serverMessage=br.readLine();
            System.out.println(serverMessage);
            //2.2 用户输入--密码---写出给服务器端
            String password=input.nextLine();
            pw.println(password);

            //3.登录之后【登录成功、登录失败】--才可以聊天
            serverMessage=br.readLine(); //读入【登录成功、登录失败】
            //字符串方法：startsWith() 返回值 boolean 前缀名称一致true
            if(serverMessage.startsWith("登录成功")){
                //封一个客户端的：读写流---chat聊天
                chat();
            }
        } catch (IOException e){
            System.out.println("客户端断开连接了！");
        } finally {
            if(br!=null)
                try {
                    br.close();
                } catch (IOException e) {
                    System.out.println("客户端关闭失败~");
                }
            if(pw!=null)
                pw.close();
            if(socket!=null&&!socket.isClosed())
                try {
                    socket.close();
                } catch (IOException e) {
                    System.out.println("通讯关闭失败~");
                }
        }
    }
    //封装一个针对聊天功能：读写  chat()
    private void chat(){
        new Thread(()->{
            try {
                String message;
                while((message=br.readLine())!=null){
                    System.out.println("服务器端说：" +message);
                    System.out.println("客户端请输入：");
                }
            } catch (IOException e) {
                System.out.println("服务器端读入失败！");
            }
        }).start();

        Scanner input=new Scanner(System.in);
        while(true){
            System.out.println("客户端请输入：");
            String line=input.nextLine();
            pw.println("客户端说："+line);
        }
    }
    public static void main(String[] args){
        new Client().start();
    }
}
